glFlush — force execution of GL commands in finite time
void fsfuncglFlush( | void); |
Different GL implementations may buffer commands in
several different locations, including the GL client, the GL
server, and the graphics accelerator.
glFlush empties all of these buffers,
causing all issued commands to be executed as quickly as they
are accepted by the actual rendering engine. Though this
execution may not be completed in any particular time period, it
does complete in finite time.
Because any GL program might be on an implementation that
buffers commands, all programs should call
glFlush whenever they count on having all
of their previously issued commands completed. For example, call
glFlush before waiting for user input that
depends on the generated image.
glFlush
can return at any time. It does not wait until the execution of
all previously issued GL commands is complete.
Copyright © 2003-2004 Silicon Graphics, Inc. This document is licensed under the SGI Free Software B License. For details, see http://oss.sgi.com/projects/FreeB/.